Regarding NFC Reader/Writer

[Ankit Gupta]

We are using tablets which doesn't have built-in NFC. Is there any NFC Reader/Writer which provides authentication for Mifare Ultralight C NFC Cards? or is there any solution for this? Currently, we are using ACR122U NFC Reader which doesn't provide authentication of Mifare Ultralight C NFC Cards

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[TapLinx Support]

Hi Ankit,

The authentication for the MIFARE Ultralight C is described in section 7.5.5 of the datasheet. In this sequence you send two times a byte sequence to the reader and get two times a sequence back. It could be that a reader manufacturer implement this in the driver and offer a “convenience function” for easy using. I cannot say anything about reader implementations.

But you can implement this in your software. All you need is a “Triple DES” library. On desktop system this is always available, e.g.: BCrypt on Windows or OpenSSL on Linux. If you use a microcontroller you must implement the DES algorithm by yourself. But you will find a lot of Open Source implementations which you can use.

The TapLinx team

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[Ankit Gupta]

Thanks for your quick response.

It would be great if you can provide any of the Open Source implementations so that we can use that.

Thanks

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